Display Data in Various Charts using Chart.js

Create a data visualization dashboard using HTML, CSS, and JavaScript with the [Chart.js](https://www.chartjs.org/) library. The application should take static or dynamic data (e.g., sales data, population statistics) and present it in different types of charts, such as bar charts, line charts, and pie charts.

Key Features:

- Import and integrate Chart.js for data visualization
- Display multiple chart types (bar, line, pie)
- Fetch or use static JSON data to populate charts
- Provide a dropdown menu to switch between different charts